Agilent Technologies 6843A User manual

Brand: Agilent Technologies

Model: 6843A

Category: Split-system air conditioners

Type: User manual

This manual is also suitable for

6814B
6834B

User’s Guide

AC Power Solutions

Agilent Models 6814B, 6834B, and 6843A

For instruments with Serial Numbers:

Agilent 6814B: 3601A-00101 through 00270

US36010101-up

Agilent 6834B: 3601A-00101 through 00140

US36010101-up

Agilent 6843A: 3540A-00101 through 00140

US35400101-up

Agilent Part No. 5962-0887 Printed in U.S.A.

Microfiche No 5962-0888 December, 1998

Update April 2000

Warranty Information

CERTIFICATION

Agilent Technologies certifies that this product met its published specifications at time of shipment from the factory.

Agilent Technologies further certifies that its calibration measurements are traceable to the United States National

Bureau of Standards, to the extent allowed by the Bureau’s calibration facility, and to the calibration facilities of other

International Standards Organization members.

WARRANTY

This Agilent Technologies hardware product is warranted against defects in material and workmanship for a period

of three years from date of delivery. Agilent Technologies software and firmware products, which are designated by

Agilent Technologies for use with a hardware product and when properly installed on that hardware product, are

warranted not to fail to execute their programming instructions due to defects in material and workmanship for a

period of 90 days from date of delivery. During the warranty period Agilent Technologies will, at its option, either

repair or replace products which prove to be defective. Agilent Technologies does not warrant that the operation for

the software firmware, or hardware shall be uninterrupted or error free.

For warranty service, with the exception of warranty options, this product must be returned to a service facility

designated by Agilent Technologies. Customer shall prepay shipping charges by (and shall pay all duty and taxes)

for products returned to Agilent Technologies for warranty service. Except for products returned to Customer from

another country, Agilent Technologies shall pay for return of products to Customer.

Warranty services outside the country of initial purchase are included in Agilent Technologies product price, only if

Customer pays Agilent Technologies international prices (defined as destination local currency price, or U.S. or

Geneva Export price).

If Agilent Technologies is unable, within a reasonable time to repair or replace any product to condition as warranted,

the Customer shall be entitled to a refund of the purchase price upon return of the product to Agilent Technologies.

LIMITATION OF WARRANTY

The foregoing warranty shall not apply to defects resulting from improper or inadequate maintenance by the

Customer, Customer-supplied software or interfacing, unauthorized modification or misuse, operation outside of the

environmental specifications for the product, or improper site preparation and maintenance. NO OTHER

WARRANTY IS EXPRESSED OR IMPLIED. AGILENT TECHNOLOGIES SPECIFICALLY DISCLAIMS THE IMPLIED

WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.

EXCLUSIVE REMEDIES

THE REMEDIES PROVIDED HEREIN ARE THE CUSTOMER’S SOLE AND EXCLUSIVE REMEDIES. AGILENT

TECHNOLOGIES, INC. SHALL NOT BE LIABLE FOR ANY DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR

CONSEQUENTIAL DAMAGES, WHETHER BASED ON CONTRACT, TORT, OR ANY OTHER LEGAL THEORY.

ASSISTANCE

The above statements apply only to the standard product warranty. Warranty options, extended support contacts,

product maintenance agreements and customer assistance agreements are also available. Contact your nearest

Agilent Technologies Sales and Service office for further information on Agilent Technologies’ full line of Support

Programs.

Safety Summary

The

ollowin

eneral sa

recautions must be observed durin

all

hases o

eration o

this instrument.

Failure to com

with these

recautions or with s

eci

ic warnin

s elsewhere in this manual violates sa

standards o

desi

n, manu

acture, and intended use o

the instrument. A

ilent Technolo

ies assumes no liabilit

or the customer’s

ailure to com

with these re

uirements.

WARNING: LETHAL VOLTAGES

Ac sources can supply 425 V peak at their output. DEATH on contact may result if the output terminals or circuits

connected to the output are touched when power is applied.

GENERAL

This product is a Safety Class 1 instrument (provided with a protective earth terminal). The protective features of

this product may be impaired if it is used in a manner not specified in the operation instructions.

Any LEDs used in this product are Class 1 LEDs as per IEC 825-1.

ENVIRONMENTAL CONDITONS

This instrument is intended for indoor use in an installation category III, pollution degree 2 environment. It is

designed to operate at a maximum relative humidity of 95% and at altitudes of up to 2000 meters. Refer to the

specifications tables for the ac mains voltage requirements and ambient operating temperature range.

BEFORE APPLYING POWER

Verify that the product is set to match the available line voltage, the correct fuse is installed, and all safety

precautions are taken. Note the instrument’s external markings described under "Safety Symbols".

GROUND THE INSTRUMENT

To minimize shock hazard, the instrument chassis and cover must be connected to an electrical ground. The

instrument must be connected to the ac power mains through a grounded power cable, with the ground wire firmly

connected to an electrical ground (safety ground) at the power outlet. Any interruption of the protective

(grounding) conductor or disconnection of the protective earth terminal will cause a potential shock hazard that

could result in personal injury.

ATTENTION: Un circuit de terre continu est essentiel en vue du fonctionnement sécuritaire de l’appareil.

Ne jamais mettre l'appareil en marche lorsque le conducteur de mise … la terre est d‚branch‚.

FUSES

Only fuses with the required rated current, voltage, and specified type (normal blow, time delay, etc.) should be

used. Do not use repaired fuses or short-circuited fuseholders. To do so could cause a shock or fire hazard.

DO NOT OPERATE IN AN EXPLOSIVE ATMOSPHERE

Do not operate the instrument in the presence of flammable gases or fumes.

DO NOT REMOVE THE INSTRUMENT COVER

Operating personnel must not remove instrument covers. Component replacement and internal adjustments must be

made only by qualified service personnel.

DO NOT EXCEED INPUT RATINGS

Operation at line voltages or frequencies in excess of those stated on the line rating label may cause leakage

currents in excess of 5.0 mA peak.

Instruments that a

ear dama

ed or de

ective should be made ino

erative and secured a

ainst unintended

eration until the

can be re

aired b

uali

ied service

ersonnel.

SAFETY SYMBOLS

Direct current

Alternating current

Both direct and alternating current

Three-phase alternating current

Earth (ground) terminal

Protective earth (ground) terminal

Frame or chassis terminal

Terminal is at earth potential. Used for measurement and control circuits designed to be

operated with one terminal at earth potential.

Terminal for Neutral conductor on permanently installed equipment

Terminal for Line conductor on permanently installed equipment

On (supply)

Off (supply)

Standby (supply). Units with this symbol are not completely disconnected from ac mains when

this switch is off. To completely disconnect the unit from ac mains, either disconnect the power

cord or have a qualified electrician install an external switch.

In position of a bi-stable push control

Out position of a bi-stable push control

Caution, risk of electric shock

Caution, hot surface

Caution (refer to accompanying documents)

WARNING

The WARNING si

n denotes a hazard. It calls attention to a

rocedure,

ractice, or the like,

which, if not correctl

erformed or adhered to, could result in

ersonal in

. Do not

roceed

ond a WARNING si

n until the indicated conditions are full

understood and met.

Caution

The CAUTION si

n denotes a hazard. It calls attention to an o

eratin

rocedure, or the like,

which, if not correctl

erformed or adhered to, could result in dama

e to or destruction of

art

or all of the

roduct. Do not

roceed be

ond a CAUTION si

n until the indicated conditions

are full

understood and met.

Declaration Page

DECLARATION OF CONFORMITY

according to ISO/IEC Guide 22 and EN 45014

Manufacturer’s Name: Agilent Technologies, Inc.

Manufacturer’s Address: 140 Green Pond Road

Rockaway, New Jersey 07866

U.S.A.

declares that the Product

Product Name: a) AC Power Source/Analyzer

b) Harmonic/Flicker Test System

Model Number(s): a) Agilent 6814A, 6814B, 6834A, 6834B

b) Agilent 6843A

conforms to the following Product Specifications:

Safety: IEC 1010-1:1990+A1(1992) / EN 61010-1:1993

EMC: CISPR 11:1990 / EN 55011:1991 - Group 1 Class A

IEC 801-2:1991 / EN 50082-1:1992 - 4 kV CD, 8 kV AD

IEC 801-3:1984 / EN 50082-1:1992 - 3 V / m

IEC 801-4:1988 / EN 50082-1:1992 - 0.5 kV Signal Lines

1 kV Power Lines

Supplementary Information:

The product herewith complies with the requirements of the Low Voltage Directive

73/23/EEC and the EMC Directive 89/336/EEC and carries the CE-marking accordingly.

New Jersey January 1997 __ __

Location Date Bruce Krueger / Quality Manager

European Contact: Your local Agilent Sales and Service Office or Agilent GmbH,

Department TRE, Herrenberger Strasse 130, D-71034 Boeblingen (FAX:+49-7031-14-3143)

Acoustic Noise Information

Herstellerbescheinigung

Diese Information steht im Zusammenhang mit den Anforderungen der

Maschinenläminformationsverordnung vom 18 Januar 1991.

* Schalldruckpegel Lp <70 dB(A)

* Am Arbeitsplatz

* Normaler Betrieb

* Nach EN 27779 (Typprüfung).

Manufacturer’s Declaration

This statement is provided to comply with the requirements of the German Sound Emission Directive,

from 18 January 1991.

* Sound Pressure Lp <70 dB(A)

* At Operator Position

* Normal Operation

* According to EN 27779 (Type Test).

Printing History

The edition and current revision of this manual are indicated below. Reprints of this manual containing

minor corrections and updates may have the same printing date. Revised editions are identified by a new

printing date. A revised edition incorporates all new or corrected material since the previous printing

date.

Changes to the manual occurring between revisions are covered by change sheets shipped with the

manual. In some cases, the manual change applies only to specific instruments. Instructions provided on

the change sheet will indicate if a particular change applies only to certain instruments.

This document contains proprietary information protected by copyright. All rights are reserved. No part

of this document may be photocopied, reproduced, or translated into another language without the prior

consent of Agilent Technologies. The information contained in this document is subject to change

without notice.

Edition 1 _________January, 1996

Edition 2 ________December, 1998

Update ________April, 2000

Table of Contents

Warranty Information 2

Safety Summary 3

Declaration Page 5

Acoustic Noise Information 6

Printing History 6

Table of Contents 7

1. GENERAL INFORMATION 9

Document Orientation 9

Safety Considerations 10

Options, Accessories, and User Replaceable Parts 10

Description 10

Capabilities 11

Front Panel/Remote Operation 12

Output Characteristic 12

Ranges 12

Output VA Capability 13

2. INSTALLATION 15

Inspection 15

Damage 15

Packaging Material 15

Items Supplied 15

Cleaning 15

Location 16

Bench Operation 16

Rack Mounting 16

Input Connections 16

Input Source and Line Fuse 17

Installing the Power Cord 17

Output Connections 18

Wire Considerations 19

Voltage Drops 19

Remote Sense Connections 20

OVP Considerations 21

Output Rating 21

Trigger Connections 21

Digital Connections 21

Controller Connections 22

GPIB Connector 22

RS-232 Interface 23

3. TURN-ON CHECKOUT 25

Introduction 25

Preliminary Checkout 25

Using the Keypad 26

Checkout Procedure 26

In Case of Trouble 29

Error Messages 29

Line Fuse 29

4. FRONT PANEL OPERATION 31

Introduction 31

Front Panel Description 31

System Keys 33

Function Keys 34

Immediate Action Keys 34

Scrolling Keys 35

Meter Display Keys 35

Output Control Keys 36

Protection and Status Control Keys 38

Trigger and List Control Keys 39

Entry Keys 40

Examples of Front Panel Programming 41

1 - Setting the Output Voltage Amplitude 41

Procedure for Three-Phase AC Sources 42

2 - Setting the Output Frequency 43

3 - Setting a Protection Feature 43

4 - Using Transient Voltage Modes 44

5 - Trigger Delays and Phase Synchronization 47

6 - Using Slew Rates to Generate Waveforms 50

7 - Measuring Peak Inrush Current 52

8 - Setting the GPIB Address and RS-232 Parameters 53

9 - Saving and Recalling Operating States 53

10 - Switching Between Single- and Three-phase Operation (Agilent 6834B only) 54

A. SPECIFICATIONS 55

Specifications 55

Supplemental Characteristics 56

B. VERIFICATION AND CALIBRATION 59

Introduction 59

Equipment Required 59

Test Setup 60

Performing the Verification Tests 60

Turn-On Checkout Procedure 60

Voltage Programming and Measurement Accuracy 61

RMS Current Readback Accuracy 61

Performing the Calibration Procedure 62

Front Panel Calibration Menu 63

Front Panel Calibration 63

Enable Calibration Mode 63

Calibrating and Entering Voltage Calibration Values 64

Calibrating and Entering Current Calibration Values 65

Calibrating the Output Impedance (Agilent 6843A only) 66

Saving the Calibration Constants 66

Changing the Calibration Password 66

Calibration Error Messages 67

Calibration Over the GPIB 67

Agilent Calibration Program Listing 67

C. ERROR MESSAGES 71

Error Number List 71

INDEX 75

General Information

Document Orientation

This manual describes the operation of the Agilent Technologies 6814B/6834B/6843A AC Power

Solutions. These units will be referred to as "ac sources" throughout this manual. Operation of the

Agilent 6843A is described for normal mode operation only. The following documents are shipped with

your ac source:

♦ a Quick-Start Guide, to help you quickly get started using the ac source

♦ a User’s Guide, containing detailed installation, checkout, and front panel information

♦ a Programming Guide, containing detailed GPIB programming information

♦ a Quick Reference Card, designed as a memory jogger for the experienced user

♦ Regulatory Test Solution User’s Guides are shipped with Agilent 6843A units only

You will find information on the following tasks in these guides. Refer to the table of contents of each

guide for a complete list of the topics.

Topic Location

Accessories and options Chapter 1 - this guide

Calibrating the ac source Appendix B - this guide

Front panel keys Chapter 4 - this guide

Front panel programming examples Chapter 4 - this guide

Line voltage connections Chapter 2 - this guide

Line voltage ratings Appendix A - this guide

Operator replaceable parts Chapter 1 - this guide

Operator troubleshooting Chapter 3 - this guide

Operating characteristics Appendix A - this guide

Performance specifications Appendix A - this guide

Quick operating checkout Chapter 3 - this guide

Rack mounting Chapter 2 - this guide

RS-232 operation Chapter 2 - this guide

SCPI programming examples Chapter 3 - Programming Guide

SCPI programming commands Chapter 4 - Programming Guide

Turn-on/checkout Chapter 3 - this guide

Wiring - discrete fault indicator (DFI) Chapter 2 - this guide

- GPIB controller Chapter 2 - this guide

- load or loads Chapter 2 - this guide

- voltage sensing (local and remote) Chapter 2 - this guide

- remote inhibit (RI) Chapter 2 - this guide

1 - General Information

Safety Considerations

This ac source is a Safety Class 1 instrument, which means it has a protective earth terminal. That

terminal must be connected to earth ground through a power source equipped with a ground receptacle.

Refer to the Safety Summary page at the beginning of this guide for general safety information. Before

installation or operation, check the ac source and review this guide for safety warnings and instructions.

Safety warnings for specific procedures are located at appropriate places in the guide.

Options, Accessories, and User Replaceable Parts

Table 1-1. Options

Option Description

400 Input power 360-440 Vac, three-phase, 47-63 Hz

1CM 2- Rack mount kit (Agilent 5062-3977)

Support rails (Agilent 5064-0001) are required (rails are not included in rack mount kit).

Table 1-2. Accessories

Item Agilent Part Number

Fuse replacement kits

30AM for 180-235 Vac, 3-phase line

GPIB cables

0.5 meters (1.6 ft)

1.0 meter (3.3 ft)

2.0 meters (6.6 ft)

3.0 meters (13.2 ft)

Heavy duty slide mount kit

5060-3513

10833D

10833A

10833B

10833C

5063-2310

Table 1-3. User Replaceable Parts List

Description Agilent Part No.

Rack mount kit See “Options”

Slide mount kit See “Accessories”

7-terminal sense connector plug 1252-3698

Sense connector cover 4040-2268

4-terminal digital connector plug 1252-1488

AC input safety cover (with strain relief and brushing) 5001-9837

Screw (4), ac input safety cover (6-32 x 1.5in) 2360-0405

Screw (8), ac input barrier block (8-32 x 5/16in) N/A

AC output safety cover 5001-9811

Screw (2), ac output safety cover (6-32 x .3in) 2460-0012

Screw (8), ac output barrier block (10-32 x .37in) N/A

Fuse safety cover 5001-9810

Screw (2), fuse safety cover (6-32 x .3in) 2460-0012

User’s Guide (this manual) 5962-0887

Programming Guide 5962-0889

Quick Start Guide 5962-0883

Quick Reference Card 5962-0885

Appropriate Agilent Regulatory Test Solution Software Agilent 14761A, 14762A, 14763A

General Information - 1

Description

The ac source combines three instruments in one unit as shown in the following figure. The function

generator produces waveforms with programmable amplitude, frequency, and shape. The power

amplifier amplifies the function generator signal to produce the ac power for your application. The

measurement functions range from a simple readback of rms voltage and current, to sophisticated

capabilities such as waveform analysis.

Figure 1-1. AC Source Functional Elements

The following model ac power sources are described in this User’s Guide:

Model Description

Agilent 6814B 3000 VA single –phase operation

Agilent 6834B 1500 VA/ phase for three-phase operation

(4500 VA for single-phase operation)

Agilent 6843A 4500 VA single-phase operation

Capabilities

♦ Programmable ac voltage, dc voltage, frequency, phase, and current limit.

♦ Sine, square, clipped sine, and user-definable waveforms.

♦ Voltage and frequency slew control.

♦ Synthesized waveform generation for high resolution and accuracy in frequency, low waveform

distortion, and glitch-free phase transitions.

♦ Step and pulse output transients for generating surge, sag, dropout, and other line disturbance

simulations.

♦ Nonvolatile list programming for generating complex output transients or test sequences.

♦ Three-phase/single-phase output capability (Agilent 6834B only)

♦ Extensive measurement capability:

•Ac rms, dc, ac+dc voltage and current and peak current.

•Real, reactive, and apparent power.

•Harmonic analysis of voltage and current waveforms gives amplitude, phase, and total

harmonic distortion results up to the 50th harmonic.

•Triggered acquisition of digitized voltage and current with extensive post-acquisition

calculations.

SOURCE

DAC

MEASUREMENT

shunt

POWERMETER

BIPOLAR

AMPLIFIER

WAVEFORM

GENERATOR

BLOCK

FFT ANALYZER

1 - General Information

•Additional total power and neutral current measurements in the three-phase model.

•All measurements made with 16-bit resolution.

♦ Trigger In and Trigger Out for synchronizing transient events or measurements with external

signals.

♦ Front panel control with 14-character vacuum fluorescent display, keypad, and rotary pulse

generators for voltage and frequency settings.

♦ Built-in GPIB and RS-232 interface programming with SCPI command language.

♦ Nonvolatile state and waveform storage and recall.

♦ Over-voltage, over-power, over-current, over-temperature, and RI/DFI protection features.

♦ Built-in output and sense disconnect relays.

♦ Extensive selftest, status reporting, and software calibration.

Front Panel/Remote Operation

The front panel has both rotary (RPG) and keypad controls for setting the output voltage and frequency.

The panel display provides digital readouts of a number of output measurements. Annunciators display

the operating status of the ac source. System keys let you perform system functions such as setting the

GPIB address and recalling operating states. Front panel Function keys access the ac source function

menus. Front panel Entry keys let you select and enter parameter values. Refer to Chapter 4 for a

complete description of the front panel controls.

Remotely programming is accomplished from either the GPIB bus or from an RS-232 serial port. GPIB

and RS-232 programming uses SCPI commands (Standard Commands for Programmable Instruments)

that make the ac source programs compatible with those of other instruments. AC source status registers

permit remote monitoring of a wide variety of ac source operating conditions

NOTE: Refer to the ac source Programming Guide for further information about remotely

programming the ac source. If you are using the Agilent 6843A, refer to the appropriate

Regulatory Test Solution User’s Guide for information about regulatory testing.

Output Characteristic

Ranges

The ac source’s output characteristic is shown in the following figure. The output voltage of the ac

source may be adjusted to any value within the range of the unit. On three-phase units, each phase can be

adjusted independently of the other two.

Rated output VA and conversion efficiency is greatest when the output voltage is set near maximum. For

this reason, the ac source is designed to operate on one of two ranges: 150 volts full-scale, or 300 volts

full-scale. You should choose the range that allows you to operate nearest the full-scale output capability

of the selected range.

General Information - 1

Figure 1-2. AC Source Output Characteristic (in real-time mode)

Output VA Capability

The output capability of each output phase is limited by VA (volts-amps) rather than power (watts). The

amount of VA available to a load can be determined by examining figure 1-3, the output power curve.

This curve rates the available VA versus output voltage. Full VA is available only at a full-scale voltage.

Full current is available at voltages between 50% and 100% of the output voltage range. Appendix A

documents the ac source’s specifications and supplemental characteristics.

NOTE: The load on the ac source may draw full VA at any power factor between 0 and 1, and

may draw maximum current with a crest factor of 4 (3 for Agilent 6843A). If the load

draws current in excess of the maximum rated rms or peak current, the voltage amplitude

will be clipped to prevent excessive internal power dissipation.

Figure 1-3. AC Source VA Capabilities

Vrms

Irms

300 V

150 V

5A 10A (6834B 3phase)

10A 20A (6814B)

16A 32A (6843A)

See Figure 1-3

15A 30A (6834B 1phase)

OUTPUT VOLTAGE, PERCENT OF RANGE

OUTPUT VA, PERCENT OF MAXIMUM

100

70 80 90 10010 20 30 40 50 60

Installation

Inspection

Damage

When you receive your ac source, inspect it for any obvious damage that may have occurred during

shipment. If there is damage, notify the shipping carrier and the nearest Agilent Sales and Support Office

immediately. The list of Agilent Sales and Support Offices is at the back of this guide. Warranty

information is printed in the front of this guide.

Packaging Material

Until you have checked out the ac source, save the shipping carton and packing materials in case the unit

has to be returned. If you return the ac source for service, attach a tag identifying the model number and

the owner. Also include a brief description of the problem.

Items Supplied

Check that the following items are included with your ac source. Some items are installed in the unit.

Power Cord

A power cord appropriate for your location. The cord may or may not be terminated in

a power plug (see "Options" in

Chapter 1). If the cord is not included, contact your

nearest

Agilent Sales and Support Offices (refer to the list at the back of this guide).

Sense/Digital connector

a 4-terminal digital plug that connects to the back of the unit.

a 7-terminal sense plug that connects to the back of the unit.

Safety covers

Ac input cover with strain relief

Ac output cover

Fuse cover

Manuals

User’s Guide

Programming Guide

Quick Start Guide

Quick Reference Card

Regulatory Test Solutions Guides (supplied with Agilent 6843A units)

Change page

If applicable, change sheets may be included with this guide. If there are change sheets,

make the indicated corrections in this guide.

Cleaning

Use a dry cloth or one slightly dampened with water to clean the external case parts. Do not attempt to

clean internally.

WARNING: To prevent electric shock, unplug the unit before cleaning.

2 - Installation

Location

Refer to the Safety Summary page at the beginning of this manual for safety-related information about

environmental conditions.

WARNING: Agilent 6814B units weigh 79.5 kg (175 lbs.)

Agilent 6834B/ 6843A units weigh 87.7 kg (193 lbs.)

Obtain adequate help when moving the unit or mounting the unit in the rack.

Bench Operation

The outline diagram in figure 2-1 gives the dimensions of your ac source. The feet may be removed for

rack mounting. Your ac source must be installed in a location that allows sufficient space at the sides and

back of the unit for adequate air circulation. Minimum clearances are 1 inch (25 mm) along the sides. Do

not block the fan exhaust at the rear of the unit.

Rack Mounting

The ac source can be mounted in a standard 19-inch rack panel or cabinet. Rack mounting kits are

available as Option 1CM or 1CP. Installation instructions are included with each rack mounting kit

CAUTION: Agilent 6814B/ 6834B/ 6843A units require instrument support rails for non-stationary

installations. These are normally ordered with the cabinet and are not included with the

rack mounting kits.

Figure 2-1. Outline Diagram

262.6mm

10.3"

12.7mm

0.5"

425.5mm

16.75"

574.7mm

22.6"

266.7mm

10.5"

19.1mm

0.8"

REAR

TOP

SIDE

Installation - 2

Input Connections

Input Source and Line Fuse

The ac source requires a 3-phase power service that provides 7350 VA (6000 W) maximum. The power

service should have a current rating greater than or equal to the ac source’s circuit breaker rating. The ac

source has a delta input (no neutral connection) and will accept power from either delta (triangle) or wye

(star) services.

CAUTION: Two input voltage ranges are available (see "AC Input Ratings" in appendix A). The ac

source will be damaged if it is operated at an input voltage that is outside of its

configured input range.

In order to maintain phase current balancing, the power service should be a dedicated line with only

Agilent 6814B/6834B/6843A ac sources drawing current from it. A disconnect box located near the ac

source is recommended for all installations and is mandatory for direct-wired installations.

Installing the Power Cord

WARNING: Installation of the power cord must be done by a qualified and licensed electrician

and must be in accordance with local electrical codes.

The power cords supplied with the ac source do not include a power plug. Terminating connectors and a

ground lug are attached to one end of the cord. See Figure 2-2 while performing the following

procedure.

1. Check the line fuses as follows:

a. Examine the FUSES label on the rear panel.

b. Remove the safety cover in front of the fuse caps.

c. Unscrew the line fuse caps from the rear panel and verify that all fuses are as

specified on the label. Reinstall the fuses.

d. Reinstall the safety cover in front of the fuse caps.

2. Remove the ac input cover from the back of the unit.

3. Open the line clamp on the ac input cover and insert the line cord through the opening.

4. Position the power cord so that the clamp is near the end of the outside insulating sheath

on the power cord. Tighten the screws to secure the clamp.

5. Secure the three ac lines to the ac power strip as follows:

Phase 1 to L1 (black).

Phase 2 to L2 (red).

Phase 3 to L3 (orange).

6. Secure the ground wire (green) to the chassis earth ground terminal.

7. Slip the safety cover over the ac input terminal strip and secure the cover with the four

screws.

8. If required, wire the appropriate power plug to the other end of the power cord. For user-

made cables, strip back the sheath 10 cm (4 in).

2 - Installation

Figure 2-2. Connecting the Power Cord

Output Connections

The power output terminal block has a termination for each of the output phases (φ1, φ2, φ3 ) and a

floating neutral line (COM) for the phase return connections. A separate earth ground terminal (⊥) is

located near the output terminals.

Figure 2-3. Output Connections

10cm (4 in.)

LINE RATIN G

CAUTION

WARNIN G

F 1

L 1

F 2 F 3

L 2 L 3

WARNING

Installation - 2

NOTE: To minimize the possibility of instability on the output, keep load leads as short as

possible bundle or twist the leads tightly together to minimize inductance

Wire Considerations

Current Ratings

Fire Hazard To satisfy safety requirements, load wires must be large enough not to overheat

when carrying the maximum short-circuit current of the ac source. If there is more

than one load, then any pair of load wires must be capable of safely carrying the

full-rated current of the ac source.

Table 2-1 lists the characteristics of AWG (American Wire Gage) copper wire.

Table 2-1. Ampacity and Resistance of Stranded Copper Conductors

AWG No. Ampacity

Resistance

(Ω/m)

AWG No. Ampacity

Resistance

(Ω/m)

14 25 0.0103 6 80 0.0016

12 30 0.0065 4 105 0.0010

10 40 0.0041 2 140 0.00064

8 60 0.0025 1/0 195 0.00040

NOTES:

1. Ampacity is based on 30

C ambient temperature with conductor rated at 60

C. For ambient

temperature other than 30

C, multiply the above ampacities by the following constants:

Temp. (

Constant

Temp. (

C) Temp. (

21-25 1.08 41-45 0.71

26-30 1.00 46-50 0.58

31-35 0.91 51-55 0.41

36-40 0.82

2. Resistance is nominal at 75

C wire temperature.

Voltage Drops

The load wires must also be large enough to avoid excessive voltage drops due to the impedance of the

wires. In general, if the wires are heavy enough to carry the maximum short circuit current without

overheating, excessive voltage drops will not be a problem. The voltage drops across the load wires

should be limited to less than 2% of the output voltage.

Refer to Table 2-1 if you need to calculate the voltage drop for some commonly used AWG copper wire.

2 - Installation

Remote Sense Connections

Under normal operation, the ac source senses the output voltage at the output terminals on the back of the

unit. External sense terminals are available on the back of the unit that allow the output voltages to be

sensed at the load, compensating for impedance losses in the load wiring. As shown in the following

figure:

♦ Connect the phase 1 (φ1) through phase 2 (φ) sense terminals to the side of the load that connects

to the corresponding output terminal.

♦ Connect the Neutral (COM) sense terminal connector to the neutral side of the load.

♦ Twist and shield all signal wires to and from the sense connectors.

The sense leads are part of the ac source’s feedback path and must be kept at a low resistance in order to

maintain optimal performance. Connect the sense leads carefully so that they do not become open-

circuited. If the sense leads are left unconnected or become open during operation, the ac source will

regulate at the output terminals, resulting in a 3% to 5% increase in output over the programmed value.

Set the ALC command to EXT (external) to enable remote sensing. The ALC command is located under

the Voltage key as explained in Chapter 4. Set the ALC command to INT (internal) to disable remote

sensing.

COM φ 3 φ 2 φ 1

φ 1 LOAD

φ 2 LOAD

φ 3 LOAD

φ 1

φ 2

φ 3

COM

⊥

NOTE: Phase 2 and phase 3 connections are

not available on 6814B/6843A units.

Connector and connections are

rotated 180 degrees for 6843A.

Figure 2-4. Remote Sense Connections

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Agilent Technologies 6843A User manual

Brand: Agilent Technologies

Model: 6843A

Category: Split-system air conditioners

Type: User manual

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